React useCallback Hook

Memoize callback functions to prevent unnecessary child re-renders.

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useCallback returns a memoized version of the callback function that only changes if one of the dependencies has changed. This prevents child components wrapped in React.memo from re-rendering.

Key Takeaways: React useCallback Hook

Mastering React useCallback Hook helps you write clean and reliable React code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

React useCallback Hook Code Example

React

import React, { useState, useCallback } from "react";

function Parent() {
  const [count, setCount] = useState(0);

  const handleClick = useCallback(() => {
    console.log("Button clicked!");
  }, []); // Function reference remains stable!

  return <button onClick={handleClick}>Click</button>;
}

Output

Maintains stable callback reference across re-renders

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React useCallback Hook

💡 Key Takeaways: React useCallback Hook

React useCallback Hook Code Example

Key Takeaways: React useCallback Hook